Over-arm.



A. L. DE LEEUW.

OVER ARM.

APPLICATION FILED MAY 10, I913- PatentedJuly 20, 1915 t ed into various positions, such supporting means being technically termed an out-- sure.

.ADOLPE L. DE LEEUw,jor CINCINNATI, OHIO, ASSIGNOR 'ro THE GINcINNAT 'MILLING MACHINE COMPANY, OF OAKLEY, CINCINNATI, OHIO, A CORPORATION 01 OHIO. I

OVER-ARM.

a new and Improved Over-Arm, of whichthe following specification is a full disclo- This invention relates to a milling machine and deals withan improved overarm structure therefor. It is primarily concerned with attaining a structure at once simple, rigid in all directions, inexpensive, and capable of being readily manufactured .by regular'shop methods so as to conform to the highest standards of precision.

Milling machines as conventionally constructed have provided meansvfor supporting the outer end of the arbor onwhich the cutter is mounted and adapted to .be adjustbearing hanger and ordinarily this merely v consists of a sort of bracket having a split clamp-collar circumscribing the over-arm which is cylindrical in form and of uniform diameter throughout. ern conditions of high duty shop'practice, considerable strains are imposed on the over-arm and the out-bearing hanger by reason of the severe duty of the cutting tool, and these are ordinarily resisted only by the friction provided by the split-collar on the cylindrical over-arm. Furthermore,

the shape of the over-arm itself is ill adapt ed to resist'the flexing strains of the cutting tool. Now this invention contemplates a structure effective to overcome those difliculties and in other respects to be better adapted to meet the conditions obtained in the annexed drawings and in part indicated in connection therewith by. the following analysis of this invention.

This invention accordingly consists in the features of construction, combinations of parts, and arrangements of elements deducible herefrom, and in the relative proportioning and unique disposition and relations of the members thereof; all as more completely outlined herein. Y

To enable others skilled in the art so fully Under m0d- Patented July so, was.

- Application med May 10,1913. Serial No. 766,905.

to comprehend the characteristics hereofv that they may embody the same by the numerous modifications in structural details contemplated by this invention, drawings depicting a preferred form have been annexed as a part of this disclosure, and in such drawings, like: characters of reference denote corresponding parts throughout all the views, of which Figure 1 is a side elevation of the upper portion of a milling machine embodying this invention, showing-the upper end of the column, and the proposed over-armcon struction therefor. Fig. 2 is an end eleva tion, partly in section, showing further detalls of the same. Fig. 3 is a section taken through line 33 of Fig. 1 showing further details in the construction of said parts.

indicated by A, and maybe similar to con ventional design except-in respect to-the construction of its upper portion, which '(lIfl' GIS therefrom by dispensing with the usual horizontal cylindrical bore employed for recelving the usual cylindrical over-arm,

and in lieu of the usual mounted upper end 'of the column an over-arm supporting deck or dove-tailed top-face is provided. Thus, the upper extremity of the column A is machined off to form a flat table or top-face 1, which constitutes the deck, upon which rests the over-arm B. This deck 1 is machined accurately parallel with the axis of y the bore 2 of the column, which receives the spindle, and the deck 1 is contoured to provide means instrumental in clamping the over-arm B against movement, and to that end it may be provided with a dove-tailed slide way 3, shown by Fig. 3 preferably ar- ,vide sufficient spring to meet the very slight through the column as indicated by Fig. 3,

and prevented from turning as by means of the pins 9. A nut'lO on a protruded end of each bolt enables the attendant to draw the tonguesinto clamping relation with a dovetail provided by the over-arm.

The over-arm 13 proposed by this invention is in the nature of a truss and preferably consists of a one-piece cast metal shell having its sides 11 forming continuations of the sides of the column. At a suitable point, say approximately midway of, the overhanging portion of this arm B a rib 12 may be cast to stiffen the same and another rib, such as indicated by 13 may be provided intermediate the supported end of the overarm and the aforesaid rib. slanting upwardly from the over-hanging end of the over-arm 13 toward the point over the column A is a top-face 14: and a similar shorter slanting top-face 15 may also be-employed. A suitably placed opening 16 provides for the removal of the core after the casting operation. The under-face 17 of the trusslike over-armB is machined very accurately in a flat plane and an accurately machined dove-tail exactly interfitting the dove-tailed slide way of the column A is also provided. This enables the over-arm B to be secured in a very accurate relation with the spindle axis of the column A.

The out-bearing hanger C is of a triangular shape and has a wide face or top-deck 19 as well as a dovetailed slide way '20, which are exact counter-parts of that provided by the column A. This enables the out-bearing hanger C to be adjusted in a straight line along the over-arm B, and it may be clamped rigidly at any station by means of the draw bolt 21 and nut 22, which brings the tongue 23 (formed by the saw-slot 24) into clamping relation with the dove-tail 18. In accurate coaxial relation with the spindle an aperture 25 will be provided in the hanger C to receive the end of the arbor mounting the cutter. lhis hanger C is preferably made of cast metal and in shell like form, as shown by the drawin s, so as to provide the maximum rigidity wit. the greatest strength.

It will thus be perceived that this invention achieves an improvement in the struc ture of a milling machine enabling the end of the arbor to be supported very accurately in coaxial relation with the spindle and at the same time rigidly and by means of a structure well adapted for economic manu facturing.

Without further elaboration, the foregoing will so fully reveal the gist of this invention that others can by applying current knowledge readily adapt it for various ap plications without omitting certain features that, from the standpoint of the prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention, and therefore such adaptations should and are intended to be comprehended within the meaning and range of equivalency of the following claims.

Having thus revealed my invention, 1 desire to claim as new and secure by Letters Patent of the United States 1. A milling machine structure of the ma ture disclosed combining a column, an overarm comprising a dove-tail slide, an outbearing hanger interfitting with said slide and comprising a resilient dove-tail slide way, and means adapted to compress said resilient slide way to clamp said hanger against movement on said slide.

2. In a milling machine, an overhanging arm having parallel lower edges of acute angular cross section, an arbor bearing having a pair of V-shaped guideways fitting upon the lower edges of the overhanging arm, one of said guideways being movable toward the other, and a clamping screw for moving said guideway to clamp the arbor bearing in its adjustments on the overhanging arm.

3. In a milling machine, a column having its upper end cut away to form V-shaped' guideways with a slot therebetween permitting one guideway to be movable toward the other, a clamping screw for moving said movable guideway, and an overhanging arm having its lower edges angular in cross section and fitting within the V-shaped guideway of the column and clamped therein by the action of the clamping screw,

4. A milling-machine combining a column having its upper end terminating in a horizontally extending dovetail slide-way, said. column being locally slotted to form at one side thereof a plurality of resilientslideway portions integral with said column but spaced apart from one another; an over-arm having its under-portion formed with a complementary dove-tail slide; and clamping screws passing horizontally through said resilient portions and engaging rigid portions of said column, whereby upon tightening said screws said resilient portions will be Mid flexed against the over-arm to bind it against A movement.

5. A milling-machine combining a column having its upper end terminating in a horizontally extending dovetail slideway; a hollow truss-shaped overarm having its under portion formed with a complementary dovetail slide, said overarm being internally provided with bracing ribs; and means for clamping the overarm to the column.

6. A milling-machine combining a column having its upper end terminating in a horizontally extending dove-tail slideway; a

truss-like overarm having its under portion formedv With a complementary dove-tail slide, and having its upper portion integrally' provided With reinforcing ribs; and means for clamping said overarm into this slideway.

In witness whereof, I hereunto subscribe ADOLPH L. DE LEEUW.

Witnesses v ALBERT F. NATHAN, OLIVER B. KAISER. 

